Alarm clock



FIG. 1 is a top, front perspective view of an alarm clock showing my new design;

FIG. 2 is a bottom, rear perspective view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a left side elevational view thereof;

FIG. 6 is a right side elevational view thereof;

FIG. 7 is a top plan view thereof; and,

FIG. 8 is a bottom plan view thereof.

The broken lines in the figures depict the portions of the alarm clock that form no part of the claimed design. 

CLAIM The ornamental design for an alarm clock, as shown and described. 